Branding

Prepare logo

First, you need to create or obtain the logo image you want to display on the ElegantOTA portal during OTA updates. Ensure that the logo image is in a suitable format, such as a SVG (recommended) / PNG or JPG file and make sure your image is optimized & small in file size.

Convert logo to a byte array

To include the logo in your library, you’ll need to convert the image into a byte array.

1. Go to File2Raw utility ( I created this utility a few years back for the purpose of converting files into byte array for C++ applications ).
2. Select your logo.
3. Select “Gzip Compress” & “Use PROGMEM (Arduino)”.
4. Click “Convert”.

Modify logo.h

1. Open the logo.h file in your ElegantOTA library source code.

2. Locate the ELEGANTOTA_LOGO byte array declaration, which should look like this:

   extern const uint8_t ELEGANTOTA_LOGO[];

3. Replace the length of the ELEGANTOTA_LOGO array with your custom logo’s byte array length.

4. Locate the ELEGANTOTA_LOGO_MIME variable, which defines the MIME type of your logo image. By default, it is set to image/png. If your logo is in a different format (e.g., JPEG), update the ELEGANTOTA_LOGO_MIME variable to the appropriate MIME type.

5. Set ELEGANTOTA_LOGO_WIDTH & ELEGANTOTA_LOGO_HEIGHT according to your desired size which will be displayed on the webpage.

Modify logo.cpp

1. Open the logo.cpp file in your ElegantOTA library source code.

2. Replace the contents of the ELEGANTOTA_LOGO array with your custom logo’s byte array generated in File2Raw utility.

Upload firmware

After making these changes, compile and upload the firmware with modified ElegantOTA library to your device.